CN106673348A - Method for treating phenol-cyanogen wastewater produced by gas generating furnace - Google Patents

Abstract

The invention discloses a method for treating phenol-cyanogen wastewater produced by a gas generating furnace. The method comprises the following treatment processes: filtering, pressurizing through CO2 and reducing iron and zinc compound powder under the action of ultrasonic, precipitating, performing hydrolytic acidification, performing aerobic treatment, treating by using a biological filter tower, and the like; the treated wastewater can meet standards and be stably discharged.

Description

The processing method of the wastewater containing phenol and cyanide that gas generator is produced

Technical field

The present invention relates to a kind of processing method of the wastewater containing phenol and cyanide of gas generator generation.

Background technology

Coal gas is a class widely used fuel in production and life, and it is to be by one in gas generator by coal Row chemical reaction and be obtained.During cooled coal gas is prepared, wastewater containing phenol and cyanide is inevitably resulted from（Waste water containing phenol and cyanogen）, If the waste water is directly discharged into environment and will cause severe contamination to environment.At present the processing method of wastewater containing phenol and cyanide mainly has biochemistry Processing method, independent burning method, controlling the water circulation coal slurry facture and it is mixed into drying tower Feedstock treating method.The process of biochemistry treatment method Effect is unstable, relatively costly；Although individually very well, processing cost is very high for burning method treatment effect；Controlling the water circulation coal slurry facture Coal slurry industry investment it is big, many producers are without this system, it is difficult to implement.It is mixed into drying tower Feedstock treating method, low-temperature zone A large amount of evaporations, thus make considerable part phenol and cyanogen have neither part nor lot in chemical reaction and enter air.Development cost is low, high treating effect The processing method of the wastewater containing phenol and cyanide that gas generator is produced has larger practical value.

The content of the invention

The problem of the processing method of the wastewater containing phenol and cyanide produced for current gas generator, the purpose of the present invention is at searching Reason low cost, the processing method of the wastewater containing phenol and cyanide of the gas generator generation of high treating effect, it is characterised in that occur coal gas The wastewater containing phenol and cyanide that stove is produced is filtered, the feeding voltage-resistant reactor after filtration, and cleaning ferrum zinc composite powder is added into reactor, is led to Enter industrial CO₂And reacted under ul-trasonic irradiation.The granularity of ferrum zinc composite powder is less than 180 mesh, every kind of in ferrum zinc composite powder The content of metal is not less than 5%（The ferrum zinc composite powder that return is used is not limited）, every liter of waste water add ferrum zinc composite powder 5g~ 10g.The stirring reaction time is 10min~40min under ul-trasonic irradiation, and temperature is 25 DEG C~60 DEG C.Every cubic metre of waste water is defeated The ultrasonic power for entering is 2kW~8kW. CO₂Pressure be 0.1MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, The ferrum zinc composite powder Returning reactor isolated.Waste water lime cream or other alkaline matters after solid-liquor separation adjusts its pH value To 6~8,1h~3h is precipitated subsequently into sedimentation tank, irregularly extract sludge out from sedimentation tank and filtered, filter cake is made dangerous solid Body waste treatment, filtrate returns sedimentation tank.The supernatant of sedimentation tank send hydrolysis acidification pool.Waste water room temperature in hydrolysis acidification pool Stop 8h~24h.Into the process of biology aerobic pond room temperature, the Aerobic Process for Treatment time is 8h~12h to waste water after hydrolysis acidification.It is aerobic Waste water after process enters sedimentation tank and precipitates 1h~3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake is made dangerous Disposition of solid waste, filtrate returns Aerobic Pond.The supernatant waste water of sedimentation tank send multi-layer biological filter tower to process.Biological filtering tower combined working is filled out Expect for activated carbon or porous ceramic grain, be 1m~2m per thickness degree, gross thickness is 2m~6m.The dominant bacteria of biological filtering tower combined working is photosynthetic Rhodopseudomonas in antibacterial（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d~100m³/ m².d.The standard water discharge discharge of biological filtering tower combined working or reuse.

The object of the present invention is achieved like this：Waste water enters the zinc of resistance to foundary weight composite powder reduction reactor, big in waste water Molecular organic, particularly persistence organic pollutant（Organic substance containing phenyl ring, heterocycle）Produced by the reduction of ferrum zinc composite powder Strong reduction free radical effect and destroy, be subsequent biochemical process create favorable conditions.It is passed through pressure CO₂Purpose be maintain Ferrum zinc composite powder reduces suitable pH value（2.0~5.0）；The effect of input ultrasound wave is to speed up the mass transport process of reduction reaction. Waste water lime cream or other alkaline matters after reduction adjusts its pH, with meet sequential hydrolysis acidifying and aerobic process will Ask.In Hydrolysis Acidification, by the effect of microorganism, larger molecular organicses further become little to the premenstrual waste water for stating process Molecular organic, is that more favorable condition is created in subsequent bio oxidation.By biological oxidation process, remaining most of Organic substance quilts Remove.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly rhodopseudomonas, Further organics removal, it is ensured that the waste water stably reaching standard discharge after process.

Relative to existing method, the outstanding advantages of the present invention are to adopt CO₂Now widely used sulphuric acid is replaced to be acidified Agent, does not introduce SO₄ ^2-Ion, essentially eliminates generation H₂The material base of S（Contain a small amount of S in wastewater containing phenol and cyanide）, so as to subtract significantly Light H₂The pollution of S, while it also avoid SO₄ ^2-To hydrolysis acidification and it is aerobic during microorganism inhibitory action, greatly improve The efficiency of biological treatment；The producer of gas generator is had, subsequent combustion device, CO needed for the present invention are had mostly₂Can be from combustion Burn isolated in the waste gas for producing, can not only reduce processing cost, and carbon emission can be reduced；Waste water energy after process is steady Determine qualified discharge, and be adapted to focusing on for the wastewater containing phenol and cyanide that remaining multiple stage gas generator is produced, investment reduction, with obvious Economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：It is daily to process 1m³The wastewater containing phenol and cyanide that gas generator is produced（pH8.3、COD_Cr8200mg/L, volatile phenol 930mg/L、CN^-4.0mg/L, T-N128mg/L）, through the reduction of ferrum zinc composite powder（Every liter of waste water add ferrum zinc composite powder 5g, when Between 30min, 25 DEG C, CO₂The ultrasonic power 4kW that pressure 0.1MPa, every cubic metre of waste water are input into）, hydrolysis acidification（24h、 pH6.0）, aerobic biochemical（12h）With activated carbon biological filtering tower combined working（Hydraulic load is 40m³/m².d, activated carbon gross thickness 2m）Process, Effluent quality is COD_Cr55mg/L、CN^-0.10mg/L, volatile phenol 0.25mg/L, T-N11mg/L.

Embodiment 2：It is daily to process 20m³The wastewater containing phenol and cyanide that gas generator is produced（pH8.2、COD_Cr7800mg/L, volatilization Phenol 760mg/L, CN^-4.2mg/L,T-N112mg/L）, through the reduction of ferrum zinc composite powder（Every liter of waste water adds ferrum zinc composite powder 10g, time 10min, 45 DEG C, CO₂The ultrasonic power 2kW that pressure 0.3MPa, every cubic metre of waste water are input into）, hydrolysis acidification （8h、pH8.0）, aerobic biochemical（8h）With porous ceramic grain biological filtering tower combined working（Hydraulic load is 100m³/m².d, porous ceramic grain gross thickness 4m）Process, effluent quality is COD_Cr43mg/L、CN^-0.07mg/L, volatile phenol 0.17mg/L, T-N9mg/L.

Claims (1)

1. a kind of processing method of the wastewater containing phenol and cyanide that gas generator is produced, it is characterised in that the phenol for producing gas generator Cyanogen waste water is filtered, the feeding voltage-resistant reactor after filtration, and cleaning ferrum zinc composite powder is added into reactor, is passed through industrial CO₂ And reacted under ul-trasonic irradiation, the granularity of ferrum zinc composite powder is less than 180 mesh, the content of every kind of metal in ferrum zinc composite powder Be not less than 5%, every liter of waste water adds ferrum zinc composite powder 5g~10g, under ul-trasonic irradiation the stirring reaction time be 10min~ 40min, temperature is 25 DEG C~60 DEG C, and the ultrasonic power of every cubic metre of waste water input is 2kW~8kW, CO₂Pressure be 0.1MPa~1.0MPa, reacted waste water carries out solid-liquor separation, the ferrum zinc composite powder Returning reactor isolated, solid-liquor separation Waste water lime cream or other alkaline matters afterwards adjusts its pH value to 6~8, and subsequently into sedimentation tank 1h~3h is precipitated, indefinite Phase extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation tank, sedimentation tank Supernatant send hydrolysis acidification pool, waste water room temperature in hydrolysis acidification pool to stop 8h~24h, and the waste water after hydrolysis acidification enters biological Aerobic Pond room temperature process, the Aerobic Process for Treatment time is 8h~12h, and the waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h~3h, no Periodically extract sludge out from sedimentation tank to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns Aerobic Pond, sedimentation tank Supernatant waste water send multi-layer biological filter tower to process, the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, and filler gross thickness is 2m ~6m, the dominant bacteria of biological filtering tower combined working is the rhodopseudomonas in photosynthetic bacteria, and the hydraulic load of biological filtering tower combined working is 30 m³/m².d ~100m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.